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Characterizing the Josephson Effect on Ba-122 Single-Crystal Junctions

  • N. HasanEmail author
  • D. Reifert
  • S. Schmidt
  • F. Schmidl
  • V. Tympel
  • T. Wolf
  • P. Seidel
Original Paper
  • 10 Downloads

Abstract

This paper presents c-direction hybrid Josephson junctions with base electrodes of Co:BaFe2As2 single crystals. To realize Josephson junctions, it applies standard photolithography technologies and a newly developed surface polishing method that was used. As conventional isotropic s-wave superconductor counter electrodes used double layers of Pb/In. The artificial barrier for the tunneling junctions consists of a thin sputtered Ti layer or a thermally evaporated Al layer; both layers were used as an insulator barrier. For characterizing the Josephson effects with TiOx barrier, we could realize IcRN products of about 13.7 μV and unconventional Ic-T dependencies. The formation of Shapiro steps under the influence of microwave irradiation and magnetic field to the junctions will be discussed as well.

Keywords

Iron pnictide Josephson junctions Single crystals 

Notes

Acknowledgments

The authors thank Dr. S. Döring for his useful comments.

Funding Information

This paper is financially supported by the EU under project no. FP7-283141 (IRON-SEA), DFG under project no. SE 664/15-2, the Landesgraduiertenförderung Thüringen, Institute of Physics IOP, and the German Academic Exchange Service (DAAD).

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Institute of Solid State PhysicsFriedrich-Schiller-University JenaJenaGermany
  2. 2.University of TechnologyBaghdadIraq
  3. 3.Physikalisch-Technische Bundesanstalt (PTB)BraunschweigGermany
  4. 4.Institute of Solid State PhysicsKarlsruhe Institute of TechnologyKarlsruheGermany

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